Re: cabsims... and even more cabsims
Posted: 27 Feb 2018, 17:34
Thanks BMXGUITARSBMX.
Something like this:
Something like this:
tracing pedals since 2007
https://www.freestompboxes.org/
Sorry, cannot help you with this. I've breadborded V30 cabsim, but I focused on the sound only, not the volume levels. There was a difference in the signal levels between the cabsims. But I only adjusted input level of the audio interface to compensate for this.caspercody wrote: Did your KMG V30 cab sim have a issue of being below unity volume? My build is slightly lower then unity volume, and I would love to get it up (volume that is). I tried increasing the voltage to 18vdc and 32vdc, but this had no improvements on volume.
by temol » 23 Apr 2018, 22:03
I'm back with six new circuits.
Setup same as previously.
Let's go
File on a Soundcloud.
sample #1 - no cabsim
sample #2 - LS10 by Lionsound.
sample #3 - 4x12 cabinet simulator by TrueVAL (ver 7.0.2012). One knob - Low boost.
sample #4 and #5 - speakersim from MARcus NRG 2400 v3.0. Two graphs, one is from a "normal" cabsim, second graph - there is another filter (opamp) that cuts around 600kHz.
The fact the oscillation occurs near the gyrator frequency points to a stability problem with the gyrator.The oscillation frequency is around 510 Hz - according to the oscilloscope, and the amplitude is quite high - 7V p-p. Any ideas how to troubleshoot it? What might be the issue here? Poor pcb design? General circuit instabillity?